O'brennan Family History

You can see how O'brennan families moved over time by selecting different census years. The O'brennan family name was found in the USA in 1880. In 1880 there was 1 O'brennan family living in Connecticut. This was about 50% of all the recorded O'brennan's in USA. Connecticut and 1 other state had the highest population of O'brennan families in 1880.

Use census records and voter lists to see where families with the O'brennan surname lived. Within census records, you can often find information like name of household members, ages, birthplaces, residences, and occupations.